A municipal water treatment facility utilizes a multi-stage emergency filtration protocol during heavy storm runoff. When incoming turbidity sensors detect sediment levels exceeding safe operating limits, the intake valve automatically restricts raw water volume to prevent filter clogging. Once the intake is restricted, chemical coagulants are injected at an elevated rate to clump the remaining suspended particles. After coagulation occurs, the water passes into the settling basins where the heavy sediment drops to the bottom before the water is directed to the secondary ultraviolet disinfection tanks.
Based on the passage, in what chronological order will the system and water treatment processes respond to a sudden surge in sediment levels?
- 1The intake valve restricts the volume of raw water entering the facility.
- 2Chemical coagulants are injected at an elevated rate to clump suspended particles.
- 3Heavy clumps of sediment settle to the bottom of the settling basins.
- 4The water is routed into the secondary ultraviolet disinfection tanks.